International Day for the Preservation of the Ozone Layer
The International Day for the Preservation of the Ozone Layer raises awareness about the importance of protecting Earth’s ozone layer, which shields life from the Sun’s harmful ultraviolet (UV) radiation. The day celebrates global cooperation that led to the Montreal Protocol, one of the world’s most successful environmental agreements. It reminds us that science, innovation, and international collaboration can solve complex environmental challenges.
How it Started…
The United Nations established the International Day for the Preservation of the Ozone Layer in 1994 to commemorate the signing of the Montreal Protocol on Substances that Deplete the Ozone Layer on September 16, 1987. The protocol brought countries together to phase out ozone-depleting chemicals such as chlorofluorocarbons (CFCs). Thanks to decades of scientific research, policy, and technological innovation, the ozone layer is gradually recovering.
How To Celebrate…
- Educational lessons about the ozone layer and Earth’s atmosphere
- Environmental awareness campaigns
- Science demonstrations about UV radiation
- School activities focused on climate and atmospheric science
- Community sustainability events
- Discussions about international environmental cooperation
- Tree planting and conservation projects
- Sharing information about protecting the environment
STEM From’s Take
Our Perspective…
The recovery of the ozone layer is one of the greatest examples of STEM solving a global problem. Scientists identified the cause of ozone depletion, engineers developed safer alternatives to harmful chemicals, policymakers used scientific evidence to guide decisions, and countries around the world worked together to protect the planet.
At STEM From, we believe this day shows students that science has real-world impact. Environmental challenges can seem overwhelming, but the success of the Montreal Protocol demonstrates that research, innovation, and collaboration can lead to measurable, positive change for people and the planet.
The Significance and Why We Care…
The ozone layer acts like Earth’s natural sunscreen, protecting humans, animals, and plants from excessive ultraviolet radiation that can increase the risk of skin cancer, cataracts, and damage to ecosystems. Preserving it helps protect biodiversity, agriculture, marine life, and human health.
This day also reminds us that many of today’s environmental challenges—such as climate change, pollution, and sustainable resource management—can be addressed through scientific research, engineering, technology, and international cooperation. It is a powerful example of how STEM professionals contribute to building a healthier and more sustainable future.
International Day for the Preservation of the Ozone Layer
STEM Fields Highlighted…
- Atmospheric Science
- Environmental Science
- Chemistry
- Climate Science
- Earth Science
- Environmental Engineering
- Chemical Engineering
- Meteorology
- Ecology
- Public Health
- Sustainability
- Environmental Policy
Fun Fact
The Montreal Protocol is often considered one of the most successful international environmental agreements in history. Scientists project that, if current commitments continue, the ozone layer could recover to approximately its 1980 levels over much of the world during the middle of this century, demonstrating the power of science-informed global action.
STEM From Activity
Build Earth’s Protective Atmosphere
Have students create a layered model of Earth’s atmosphere, labeling:
- Troposphere
- Stratosphere
- Ozone Layer
- Mesosphere
- Thermosphere
Then discuss why the ozone layer is located in the stratosphere and how it protects life by absorbing much of the Sun’s harmful ultraviolet radiation.
Discussion Questions
- Why is the ozone layer important for life on Earth?
- How did scientists discover that the ozone layer was being depleted?
- Why is international cooperation important for solving environmental problems?
- How are chemistry and engineering used to develop environmentally safer products?
- What other global environmental challenges could STEM help solve?
- If you were an environmental scientist, what problem would you want to investigate?
